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sanity check of ipiv from cblas_dgesv

This commit is contained in:
Jiri Pittner 2023-05-15 16:45:22 +02:00
parent aa169dd045
commit abdf6cdd73
1 changed files with 6 additions and 2 deletions
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8
nonclass.cc
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@ -26,7 +26,7 @@
#include "qsort.h"
#include "fortran.h"
#define IPIV_DEBUG
#undef IPIV_DEBUG
namespace LA {
@ -155,7 +155,11 @@ static void linear_solve_do(NRMat<double> &A, double *B, const int nrhs, const i
for (int i=0; i<n; ++i) {double t=A[i][i]; if(!finite(t) || std::abs(t) < EPSDET ) {*det=0.; break;} else *det *=t;}
//find out whether ipiv are numbered from 0 or from 1
int shift=1;
for (int i=0; i<n; ++i) if(ipiv[i]==0) shift=0;
for (int i=0; i<n; ++i)
{
if(ipiv[i]==0) shift=0;
if(ipiv[i]<0 || ipiv[i]>n) laerror("problem with ipiv in clapack_dgesv");
}
#ifdef IPIV_DEBUG
std::cout <<"shift = "<<shift<<std::endl;
#endif